Soil conditioner composition comprising cellulose derivative supporting particles

Abstract

The present invention relates to a soil conditioner composition comprising cellulose derivative-supporting particles in which cellulose derivative particles (component (B)) are supported on the surfaces of water-insoluble particles (component (A)).

Description

Technical Field

[0001] This invention relates to a soil conditioner composition comprising cellulose derivative-supported particles. Background Technology

[0002] Cellulose derivatives such as carboxymethyl cellulose (CMC) are used in various fields due to their water absorption properties. For example, Japanese Patent Application Publication No. 2004-236530 discloses a potting soil that contains 0.0001 to 0.5 parts by weight of a water-soluble cellulose derivative relative to 100 parts by weight of soil. Japanese Patent Application Publication No. 2000-271597 discloses a sludge treatment agent characterized by containing 5 to 2000 parts by weight of inorganic powder relative to 100 parts by weight of an alkali metal salt of carboxymethyl cellulose. Furthermore, Japanese Patent Application Publication No. 2002-363562 discloses a granular soil conditioner water-retaining agent comprising a base material and a water-soluble cellulose ether. Furthermore, Japanese Patent Application Publication No. 2002-556613 discloses a mixture of a carrier and additive for a germination unit, which contains one or more substances formed from granular expanded vermiculite, perlite, zeolite, lignocellulose, cellulose materials, and mineral fibers, and also contains one or more water-absorbing substances such as superabsorbent polymers (SAP) or CMC. In addition, Japanese Patent Application Publication No. 2016-052659 discloses a granular treatment agent comprising a water-absorbing polymer such as a cellulose-based polymer and binder particles, wherein the binder particles contain an adhesive and slaked lime or limestone, for treating manure, organic sludge, plants and animals, livestock, livestock sheds, or soil. Summary of the Invention

[0003] It is known that dispersing cellulose derivatives such as CMC in soil can impart high drainage properties. However, since soil dispersal is mostly carried out outdoors, the cellulose derivatives are dispersed by wind, which may prevent efficient dispersal. Therefore, there is a need for technologies that can exhibit high drainage properties based on cellulose derivatives while suppressing their dispersion.

[0004] In order to solve the above problems, the inventors conducted in-depth research and found that by using cellulose derivative-supported particles ((B) component) on the surface of water-insoluble particles ((A) component), the drainage of soil is improved and the dispersion inhibition of cellulose derivative-supported particles is good.

[0005] Specifically, this invention relates to a soil conditioner composition comprising cellulose derivative-supported particles (component B) on the surface of water-insoluble particles (component A). This invention also relates to a soil improvement method using the soil conditioner composition comprising cellulose derivative-supported particles.

[0006] By using the soil conditioner composition of the present invention containing cellulose derivative-supported particles, good drainage properties based on cellulose derivatives can be exhibited while suppressing the dispersion of cellulose derivatives. Attached Figure Description

[0007] Figure 1 This is a 100x microscope image of silica sand with cellulose derivatives loaded on its surface.

[0008] Figure 2 This is a 50x microscope image of silica sand as component (A).

[0009] Figure 3 This is a 50x microscope image of carboxymethyl cellulose as component (B). Detailed Implementation

[0010] The soil conditioner composition of the present invention (hereinafter referred to as the composition of the present invention) comprises cellulose derivative supported particles (hereinafter referred to as supported particles) on the surface of water-insoluble particles ((A) component) having cellulose derivative particles ((B) component) supported on them.

[0011] It should be noted that, in this invention, soil improvement refers to enhancing soil drainage. Furthermore, it is expected to promote soil aggregate formation, increase soil air content, and reduce soil hardness.

[0012] In fields where crops are cultivated, soil properties are a crucial factor from a productivity standpoint. In particular, it is known that poor drainage in fields can lead to reduced crop yields due to waterlogging (Journal of the Japanese Society of Crop Science, Japanese Society of Crop Science, 2011, Vol. 80, No. 1, pp. 65-72). Various forms of soil conditioners have been developed to improve drainage. However, in recent years, there has been a demand for more economical and convenient soil conditioners.

[0013] In this invention, it is believed that because the cellulose derivative does not disperse but rather disperses in the soil, it effectively adheres to the soil, thereby forming aggregates and improving soil drainage. In particular, it is believed that the cellulose derivative gels upon contact with water, uniformly coating the soil, thus maintaining the aggregates, improving drainage, and reducing soil hardness. Therefore, it is believed that even in dry soil conditions, the coating of the cellulose derivative can inhibit soil aggregation.

[0014] Hereinafter, "soil drainage" will also be referred to as "drainage". In addition, "scattering of cellulose derivative particles ((B) component)" will also be referred to as "scattering". Furthermore, the ability to inhibit "scattering" will also be referred to as "scattering inhibition".

[0015] First, the definitions and measurement methods of the supported particles, components (A) and (B) used in the manufacture of the supported particles, and the average particle size of the composition will be explained.

[0016] In this invention, the average particle size is determined using a sieve. Specifically, five types of sieves with aperture sizes of 100 μm, 250 μm, 425 μm, 1000 μm, and 2000 μm are used to classify the loaded particles, component (A), and composition into (iA) 2000 μm or more, (ii-A) 1000 μm or more and less than 2000 μm, (iii-A) 425 μm or more and less than 1000 μm, and (iv-A) 250 μm or more and less than 425 μm. Six particle types, namely (vA) ≥100μm and <250μm, (vi-A) <100μm, were used as representative values ​​for particle size. The weight-average values ​​were calculated using (iA) 3000μm, (ii-A) 1500μm, (iii-A) 712.5μm, (iv-A) 337.5μm, (vA) 175μm, and (vi-A) 50μm, and the calculated weight-average values ​​were used as the average particle size.

[0017] (B) The components were prepared using six sieves with aperture sizes of 20 μm, 45 μm, 75 μm, 100 μm, 250 μm, and 425 μm, categorized as follows: (ib) 425 μm and above, (ii-b) 250 μm and above but less than 425 μm, (iii-b) 100 μm and above but less than 250 μm, (iv-b) 75 μm and above but less than 100 μm, (vb) 45 μm and above but less than 75 μm, and (vi-b)... Seven particle sizes, namely (20 μm and above, but less than 45 μm) and (vii-b) less than 20 μm, were used as representative values ​​for particle size. The following values ​​were used for calculation: (ib) 500 μm, (ii-b) 337.5 μm, (iii-b) 175 μm, (iv-b) 87.5 μm, (vb) 60 μm, (vi-b) 32.5 μm, and (vii-b) 10 μm. The calculated weight average value was taken as the average particle size.

[0018] Furthermore, the distribution classified by the above method is referred to as particle size distribution in this application.

[0019] From the viewpoint of improving drainage and scattering suppression, the average particle size of the loaded particles in this invention is preferably 200 μm or more, more preferably 250 μm or more, even more preferably 300 μm or more, and preferably 1000 μm or less, more preferably 700 μm or less, and even more preferably 600 μm or less.

[0020] When the amount of supported particles with a diameter of less than 250 μm is less than 50% by mass, the dispersion suppression performance is improved. Furthermore, when the amount of supported particles with a diameter of 1000 μm or larger is less than 30% by mass, the drainage performance is improved.

[0021] It should be noted that loaded particles with a diameter less than 250 μm refer to loaded particles that pass through a sieve with a sieve aperture of 250 μm. Conversely, loaded particles with a diameter greater than 1000 μm refer to loaded particles that do not pass through a sieve with a sieve aperture of 1000 μm.

[0022] From the viewpoint of improving drainage, the amount of component (B) in the carrying particles of the present invention is preferably 1 part by mass or more, more preferably 3 parts by mass or more, and even more preferably 10 parts by mass or more, relative to 100 parts by mass of component (A). Furthermore, it is preferably 100 parts by mass or less, more preferably 70 parts by mass or less, and even more preferably 50 parts by mass or less.

[0023] As described below, the average particle size of the insoluble particles of component (A), which is a constituent of the carrying particles in the present invention, is preferably 180 μm or more, more preferably 200 μm or more, even more preferably 250 μm or more, and preferably 1000 μm or less, more preferably 650 μm or less, and even more preferably 350 μm or less.

[0024] In addition, the average particle size of component (B) is preferably 10 μm or more, more preferably 20 μm or more, and even more preferably 200 μm or less, more preferably 100 μm or less.

[0025] Therefore, the preferred loaded particles are those of a smaller (B) component loaded on the surface of a larger (A) component.

[0026] Furthermore, particles other than component (B) may be optionally supported on the surface of component (A), but from the viewpoint of improving drainage and dispersion suppression, the content of component (B) particles in the supported particles is preferably 70% by mass or more, more preferably 90% by mass or more, and more preferably 100% by mass or less.

[0027] From the perspective of improving dispersion suppression, the bulk density of water-insoluble particles of component (A) is preferably 0.5 g / cm³. ３ The above, more preferably 0.8 g / cm³ ３ The above is further preferred to be 1.0 g / cm³. ３ That's all. With this packing density, scattering suppression is good.

[0028] Furthermore, from the viewpoint of drainage, the bulk density of the water-insoluble particles of component (A) is preferably 1.5 g / cm³. ３The following is more preferably 1.4 g / cm³ ３ The following is a further preferred value: 1.35 g / cm³ ３ The following is a further preferred value: 1.3 g / cm³ ３ the following.

[0029] Specifically, water-insoluble particles used as component (A) can include: plant materials such as palm shells, peat moss, bagasse, rice husks, and sawdust; non-porous inorganic materials such as silica sand, sea sand, alumina sand, talc, bentonite, and calcium carbonate; and porous inorganic materials such as vermiculite, attapulgite, diatomaceous earth, zeolite, and perlite.

[0030] Among them, palm shell is preferred as a plant material, zeolite is preferred as a porous inorganic material, and at least one of silica sand, sea sand, alumina sand, talc, bentonite and calcium carbonate is preferred as a non-porous inorganic material. From the aspects of moderate bulk density, good dispersion inhibition, low water absorption and good drainage, non-porous inorganic materials are preferred, and silica sand and calcium carbonate are more preferred.

[0031] From the viewpoint of obtaining supported particles with good drainage and dispersion suppression, the average particle size of the insoluble particles of component (A) as raw material is preferably 180 μm or more, more preferably 200 μm or more, even more preferably 250 μm or more, and preferably 1000 μm or less, more preferably 650 μm or less, and even more preferably 350 μm or less.

[0032] (A) When the amount of particles with a diameter of less than 250 μm is less than 50% by mass in the particle composition, the dispersion suppression is improved. In addition, when the amount of particles with a diameter of 1000 μm or more is less than 50% by mass, the drainage performance is improved.

[0033] It should be noted that particles with a diameter less than 250 μm refer to particles that pass through a sieve with a sieve aperture of 250 μm. Conversely, particles with a diameter greater than 1000 μm refer to particles that do not pass through a sieve with a sieve aperture of 1000 μm.

[0034] From the viewpoint of improving drainage performance, the ratio of the average particle size of the carrying particles to the average particle size of component (A) [average particle size of the carrying particles] / [average particle size of component (A)] is preferably 1.0 or more, more preferably 1.3 or more, even more preferably 1.4 or more, and preferably 3.0 or less, more preferably 2.5 or less.

[0035] The value of [average particle size of the supported particles] / [average particle size of component (A)] can be calculated, for example, as follows. As mentioned above, the average particle size of component (A) is larger than that of component (B). Therefore, when sieving the composition, particles smaller than the maximum particle size of component (B) of the raw material can be considered as unsupported component (B). Therefore, by calculating the average particle size of the supported particles obtained after removing particles smaller than the maximum particle size of component (B) and dividing it by the average particle size of component (A) used as the raw material, the value can be calculated.

[0036] In addition, the cellulose derivative is dissolved from the obtained supported particles using a solvent such as water in an amount 1000 times greater than the amount of the supported cellulose derivative, followed by centrifugation and washing. Then, for the freeze-dried component (A), the average particle size is determined using a sieve, and the average particle size of the supported particles is divided by the average particle size of the remaining component (A) to calculate the particle size.

[0037] Cellulose derivatives that constitute cellulose derivative particles of component (B) can be exemplified by the following cellulose derivatives.

[0038] (B-1) Carboxyalkyl cellulose or its salts in which some or all of the hydrogen atoms of the hydroxyl groups of cellulose are replaced by carboxyalkyl groups, such as carboxymethyl cellulose or its salts, carboxyethyl cellulose or its salts, etc., having a carboxyl group bonded to an alkyl group having 1 or more but less than 4 carbon atoms (wherein the salt is a sodium salt, potassium salt, calcium salt, ammonium salt, etc.).

[0039] (B-2) Cellulose in which some or all of the hydrogen atoms of the hydroxyl groups are replaced by carboxyl alkyl groups and alkyl groups, such as (carboxymethyl) methyl cellulose or its salts, (carboxymethyl) ethyl cellulose or its salts, etc., having a group having a carboxyl group bonded to an alkyl group having 1 or more and 4 or fewer carbon atoms and an alkyl group having 1 or more and 4 or fewer carbon atoms, (wherein the salt is a sodium salt, potassium salt, calcium salt, ammonium salt, etc.).

[0040] (B-3) Alkyl cellulose, in which some or all of the hydrogen atoms of the hydroxyl groups are replaced by alkyl groups, such as methyl cellulose, ethyl cellulose, etc., in which the alkyl group has 1 or more but less than 4 carbon atoms.

[0041] (B-4) Hydroxyalkyl cellulose, in which some or all of the hydrogen atoms of the hydroxyl group are replaced by hydroxyalkyl groups, such as hydroxyethyl cellulose, hydroxypropyl cellulose, etc., in which the hydroxyalkyl group has 2 or more but less than 4 carbon atoms.

[0042] (B-5) (alkyl)hydroxyalkyl cellulose, in which some or all of the hydrogen atoms of the hydroxyl group are replaced by alkyl groups and hydroxyalkyl groups, such as (hydroxyethyl)methylcellulose, (hydroxyethyl)ethylcellulose, (hydroxypropyl)methylcellulose, (hydroxypropyl)ethylcellulose, etc., in which the alkyl group has 1 or more carbon atoms and 4 or fewer carbon atoms, and the hydroxyalkyl group has 2 or more carbon atoms and 4 or fewer carbon atoms.

[0043] From the viewpoint of improving drainage performance, the cellulose derivative of component (B) is preferably a carboxyalkyl cellulose or its salt of (B-1). Carboxymethyl cellulose or its salt is preferred. The carboxyl group may be selected from: alkali metal salts such as sodium or potassium salts; alkaline earth metal salts such as magnesium or calcium salts; or ammonium ion salts. Alkali metal salts are preferred, and sodium salts are more preferred.

[0044] The cellulose derivative constituting component (B) is a cellulose derivative in which some or all of the hydrogen atoms in the hydroxyl groups of cellulose are substituted. The degree of substitution is defined as an indicator of the extent to which the hydrogen atoms in the three hydroxyl groups contained in the glucose units of cellulose are substituted. For example, the degree of substitution is 1 when an average of one hydrogen atom in the three hydroxyl groups is substituted, and the degree of substitution is 3 when all three hydrogen atoms are substituted. The degree of substitution can be, for example, determined by... 1 H or 13 The result is calculated by integrating the peaks of the unsubstituted methylene groups or carbons in the glucose unit with the peaks of the substituent groups or carbons.

[0045] From the viewpoint of improving drainage performance, the degree of substitution is preferably 0.3 or more, more preferably 0.6 or more, even more preferably 1.0 or more, and preferably 1.8 or less, more preferably 1.6 or less.

[0046] From the viewpoint of improving drainage, the viscosity of the cellulose derivative of component (B) is preferably 5 mPa·s or more, more preferably 15 mPa·s or more, even more preferably 100 mPa·s or more, and preferably 5000 mPa·s or less, more preferably 4000 mPa·s or less, and even more preferably 3500 mPa·s or less.

[0047] The cellulose derivative of component (B) can be in the form of particles, fibers, or membranes, but from the viewpoint that it is easy to be supported on the surface of component (A), it is more preferably in the form of particles. That is, component (B) is preferably a cellulose derivative particle.

[0048] When cellulose derivative particles are used as component (B), the average particle size of the particles is preferably 10 μm or more, more preferably 20 μm or more, and preferably 200 μm or less, more preferably 100 μm or less.

[0049] Furthermore, in component (B), when the amount of particles with a diameter of 250 μm or larger is less than 50% by mass, the water drainage performance of the composition is improved during use. Additionally, when the amount of particles smaller than 20 μm is less than 20% by mass, it is easier to produce supporting particles.

[0050] It should be noted that particles with a diameter of 250 μm or larger are particles that cannot pass through a sieve with a sieve aperture of 250 μm. Conversely, particles with a diameter of less than 20 μm are particles that can pass through a sieve with a sieve aperture of 20 μm.

[0051] The average particle size of the supported particles can be measured by excluding (B) component that was not supported on the surface of (A) component during manufacturing. This method can be performed, for example, as follows: As mentioned above, the average particle size of the (A) component used is larger than the average particle size of the (B) component. Therefore, particles smaller than the maximum particle size of the (B) component during sieving can almost all be considered as (B) component. Thus, the particles obtained after removing particles smaller than the maximum particle size of the (B) component can be considered essentially supported particles. The average particle size of these particles can be calculated and used as the average particle size of the supported particles. While the average particle size of the supported particles obtained in this way also depends on the content of (B) component on the surface of the unsupported (A) component, it is generally the same or slightly larger.

[0052] The method for manufacturing the supported particles in this invention is not particularly limited, and common methods such as mixing, impregnation loading, and initial wetting can be used. From the viewpoint of high loading efficiency of cellulose derivatives, the mixing method carried out in the presence of water is preferred.

[0053] Mixing in the presence of water can be carried out, for example, through the following steps.

[0054] (Step 1) Mixing water-insoluble particles (component (A)) with water to obtain water-insoluble particles with water adhering to their surface.

[0055] (Step 2) The process of adding cellulose derivative particles (component (B)) to the water-insoluble particles with water adhering to their surface obtained in Step 1 and mixing them.

[0056] (Step 3) The water-containing mixture obtained in Step 2 is dried while being stirred as needed to obtain cellulose derivative-supported particles on the surface of water-insoluble particles (component A) with cellulose derivative particles (component B) supported on the surface.

[0057] In addition, the following processes may be included as needed.

[0058] (Step 4) The mixture obtained in step 3 is stirred again to refine the agglomerated supported particles.

[0059] It should be noted that steps 3 and 4 can also be performed simultaneously.

[0060] The amount of water added in step 1 depends on the amount of component (B) relative to 100 parts by mass of component (A), and cannot be generalized. However, for example, by adding 0.5 to 30 parts by mass relative to 100 parts by mass of component (A), component (B) can be effectively supported. That is, by adding water at 0.5 to 30 parts by mass relative to 100 parts by mass of component (A), it is possible to obtain supported particles in which approximately 100% of the added component (B) is supported on the surface of component (A), and component (B) is at 1 to 100 parts by mass relative to 100 parts by mass of component (A).

[0061] More specifically, when component (A) is a non-porous inorganic material, from the viewpoint of improving the carrying capacity of component (B) relative to component (A), the amount of water added is preferably 0.5 parts by mass or more and 15 parts by mass or less relative to 100 parts by mass of component (A). Furthermore, when component (A) is a porous inorganic material, since porous inorganic materials absorb water, the amount of water added is preferably 10 parts by mass or more and 30 parts by mass or less relative to 100 parts by mass of component (A).

[0062] The mixing and stirring in steps 1 to 4 can be done using a Henschel mixer, a grate mixer, or a spiral mixer, or by using a magnetic stir bar on a stirrer, or by manual mixing. The stirring time also depends on the amount of component (A) and component (B) used, and can be 30 seconds or more.

[0063] The resulting composition and supported particles may be dried as needed. Drying can be carried out at a temperature above 50°C and below 150°C. The drying time, depending on the amount of component (A), component (B), and water, is sufficient for at least one minute. Furthermore, the resulting composition and supported particles may be finely agglomerated by stirring or the like, as needed. The drying time, depending on the amount of component (A), component (B), and water, is sufficient for at least one minute.

[0064] The compositions of the present invention may, as needed, contain surfactants, bactericides, dispersants, polymers, etc. Additionally, the compositions may also contain component (A).

[0065] As surfactants, one or more surfactants selected from nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants can be used, with nonionic surfactants being preferred. The content of these additives in the composition of the present invention can be 0.001% by mass or more and 10% by mass or less.

[0066] Furthermore, from the viewpoint of suppressing scattering and improving drainage, the composition of the present invention preferably contains 60% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, and even more preferably 90% by mass or more of cellulose derivative supported particles on the surface of water-insoluble particles ((A) component) on which cellulose derivative particles ((B) component) are supported.

[0067] The method of distributing the composition of the present invention is not particularly limited, and a hand-push distributor, a lime spreader, a wide-angle spreader, etc. can be used.

[0068] <Soil Improvement Methods>

[0069] The soil improvement method of the present invention can be implemented using the composition of the present invention, and is a soil improvement method that mixes the composition of the present application into the soil.

[0070] The soil targeted by this invention is preferably arable land for the growth of plants and crops. Regarding the soil targeted by this invention, it is applicable to various types of soil, and is particularly suitable for agricultural soils, especially field soils. That is, the soil conditioner composition of this invention is preferably for agricultural use, and more preferably for field use.

[0071] In this invention, the addition of the composition of this invention to soil can be carried out by methods such as mixing the composition with soil, dispersing the composition in soil, or combining these methods.

[0072] In fields, as a specific method for adding component (A) and the composition of the present invention to the soil, one can exemplify a method of tilling the soil while spreading component (A) and the composition of the present invention using a tiller and a spreader.

[0073] In this invention, the composition is preferably added in amounts of 0.001 parts by mass or more, more preferably 0.005 parts by mass or more, relative to 100 parts by mass of soil. Furthermore, it is preferably less than 10 parts by mass, more preferably less than 5 parts by mass, even more preferably less than 2.5 parts by mass, even more preferably less than 2.0 parts by mass, even more preferably less than 1.0 parts by mass, and even more preferably less than 0.3 parts by mass.

[0074] In addition, the amount of cellulose derivative added to the soil as component (B) is preferably 0.0001 parts by mass or more, more preferably 0.0004 parts by mass or more, and even more preferably 0.95 parts by mass or less, more preferably 0.5 parts by mass or less, even more preferably 0.05 parts by mass or less, and even more preferably 0.03 parts by mass or less.

[0075] When the composition of the present invention is added to the soil by means of dispersing, for example, using the soil improvement method of the present invention, the amount of composition added relative to soil 10a is preferably 0.4 kg or more, more preferably 2 kg or more, further preferably 4000 kg or less, more preferably 2000 kg or less, even more preferably 1000 kg or less, even more preferably 800 kg or less, even more preferably 400 kg or less, and even more preferably 120 kg or less.

[0076] In addition, the amount of cellulose derivative added to the soil is preferably 0.04 kg or more, more preferably 1.6 kg or more, and even more preferably 390 kg or less, more preferably 200 kg or less, further preferably 20 kg or less, and even more preferably 12 kg or less, relative to 10 years of soil.

[0077] Example

[0078] The present invention will now be described in detail with reference to embodiments and comparative examples, but the present invention is not limited to the following description.

[0079] Components (A) and (B) used as raw materials, the manufactured composition, and the average particle size and particle size distribution of the supported particles were determined by the method described above using a sieve. The sieve used is as follows.

[0080] (A) Composition and loaded particles: SANPO manufactured models 200×45 / 100μm (sieve aperture 100μm), 200×45 / 250μm (sieve aperture 250μm), 200×45 / 425μm (sieve aperture 425μm), 200×45 / 1mm (sieve aperture 1000μm), and 200×45 / 2mm (sieve aperture 2000μm).

[0081] (B) Composition: New Perlon sieveψ200 (20μm sieve aperture) manufactured by Ito Manufacturing Co., Ltd., and SANPO manufactured models 200×60 / 45μm (45μm sieve aperture), 75×20 / 75μm (75μm sieve aperture), 200×45 / 100μm (100μm sieve aperture), 200×45 / 250μm (250μm sieve aperture), and 200×45 / 425μm (425μm sieve aperture).

[0082] <Manufacturing of Cellulose Derivative Supported Particles>

[0083] As component (A), the following components are used.

[0084] (A1) Silica Sand 1: Silica Sand No. 7

[0085] (A2) Silica Sand 2: Silica Sand No. 6 from the Yamashita Building Materials Store of the Limited Company

[0086] (A3) Silica Sand 3: Silica Sand No. 5 from the Yamashita Building Materials Store of the Limited Company

[0087] (A4) Silica Sand 4: Silica sand obtained by sieving No. 5 silica sand from the Yamashita Building Materials Store of the Limited Company and recovering particles with a particle size of 100μm or larger and less than 250μm.

[0088] (A5) Silica Sand 5: Silica sand obtained by sieving No. 4 silica sand from the Yamashita Building Materials Store of the Limited Company and recovering particles with a particle size of 1000μm or larger and smaller than 2000μm.

[0089] (A6) Silica Sand 6: Silica sand obtained by sieving No. 5 silica sand from the Yamashita Building Materials Store of the Limited Company and recovering particles with a particle size of 425μm or larger and less than 1000μm.

[0090] (A7) Calcium Carbonate 1: Sankyo Fine Chemicals Co., Ltd. K-1

[0091] (A8) Calcium Carbonate 2: Sankyo Fine Chemicals Co., Ltd. K-3

[0092] (A9) Zeolite (abbreviated as ZE): Nitto Powdered Chemical Industry Co., Ltd. Nitto Zeolite No. 1

[0093] (A10) Palm Shell: JAPAN PULP AND PAPER COMPANY LIMITED

[0094] (A11) Diatomaceous earth: Showa Chemical Industry Co., Ltd. Radiolite #3000

[0095] The particle size distribution, average particle size, and bulk density of component (A) above are shown in Table 1. The bulk density was determined using a bulk density meter (JIS K 3362) manufactured by Kyotsutsui Rikika Machinery Co., Ltd.

[0096] [Table 1]

[0097]

[0098] In the table, the lower limit of each particle size range is included, but the upper limit is not. For example, "100-250μm" means "above 100μm and below 250μm". The same applies to the following tables.

[0099] As component (B), the following components are used.

[0100] (B1) Sodium Carboxymethyl Cellulose (hereinafter referred to as CMC) 1: Daicel Miraizu Co., Ltd. CMC DAICEL1390

[0101] (B2)CMC2: Daicel Miraizu Co., Ltd. CMC DAICEL 2260

[0102] (B3)CMC3: Nippon Paper Co., Ltd. F600MC

[0103] (B4)CMC4: Nippon Paper Co., Ltd. SUNROSE B3B

[0104] (B5)CMC5: Obtained by sieving Nippon Paper Co., Ltd. F300HG sieve to recover particles smaller than 425μm.

[0105] (B6) Hydroxypropyl methylcellulose (HPMC): Shin-Etsu Chemical Co., Ltd. METOLOSE 65SH-15000

[0106] (B7) Hydroxyethyl cellulose (HEC): Daicel Miraizu Co., Ltd. HEC Daicel SP9000

[0107] (B8) Powdered cellulose (abbreviated as CEL): Nippon Paper Corporation W-300G

[0108] (B9) Polyacrylamide, Crosslinked Acrylamide-Acrylic Acid Copolymer (SAP): Superabsorbent Polymer (acrylate-based) from Fujifilm and Kojun Pharmaceutical Co., Ltd.

[0109] The particle size distribution, average particle size, viscosity and degree of substitution of component (B) above are shown in Table 2.

[0110] Prepare 1% aqueous solutions of each (B) component and measure the viscosity at 25°C using a viscometer (TVB-10 manufactured by Toki Sangyo Co., Ltd.).

[0111] For (B1) to (B5), the degree of substitution is determined using the following method.

[0112] Add 0.1 g of CMC to a 10 mL screw-top test tube, then add 1 mL of heavy water (1 / 1 mL heavy water / hydrogen sulfate ratio) and stir with a vortex mixer for 1 minute. Heat at 90°C for 2 hours, then centrifuge. Transfer the supernatant to an NMR tube for further analysis. 1 ¹H-NMR determination. The integral value of one proton of the sugar backbone and the integral value of two methylene protons of the carboxymethyl group are determined from the obtained spectrum. The degree of substitution is obtained by dividing (the integral value of the methylene protons of the carboxymethyl group / 2) by the value of one proton of the sugar backbone.

[0113] < １ Conditions for H-NMR measurement >

[0114] Device: Bruker AVANCE NEO400N

[0115] Magnetic field strength: 400MHz

[0116] Total number of times: 128

[0117] Waiting time: 30 seconds

[0118] Pulse width: 45°

[0119] Data points: 65536

[0120] Temperature: Room temperature

[0121] Observation width: 8196Hz

[0122] For (B6), the degree of substitution was determined by the following method.

[0123] Add 1 g of HPMC to a beaker, then add 30 mL of 65 wt% sulfuric acid and stir at 20 °C for 30 minutes. Then add 60 mL of deionized water and react at 90 °C for 2 hours. After neutralization with barium carbonate, filter and concentrate. Add 1 mL of heavy water to the resulting concentrate and... 13 The determination was performed using C-NMR. The degree of substitution was calculated from the carbon of the methyl group relative to the carbon at position 1 in the cellulose backbone and the carbon of the methyl group derived from the hydroxypropoxy group.

[0124] < 13 C-NMR measurement conditions>

[0125] Device: Varian Mercury 400BB

[0126] Magnetic field strength: 100MHz

[0127] Total number of times: 5000

[0128] Waiting time: 1 second

[0129] Pulse width: 45°

[0130] Data points: 65536

[0131] Temperature: Room temperature

[0132] Observation width: 25188.9Hz

[0133] [Table 2]

[0134]

[0135] Using components (A) and (B) above, cellulose derivative supported particles were manufactured by the following method.

[0136] Weigh a specified amount of component (A) into a 100 mL polymer container, add a specified amount of deionized water, and stir for 1 minute to make the mixture homogeneous, thus obtaining mixture A. Add a specified amount of component (B) to mixture A, let it stand for 30 seconds, and then stir for 1 minute to obtain mixture B. Dry mixture B at 80°C for 3 minutes, remove it, and stir for 1 minute. Repeat the above operation a total of 3 times to obtain the composition.

[0137] It should be noted that, for Comparative Examples 9 and 14, cellulose derivative-supported particles were manufactured by the following method.

[0138] Mix components (A) and (B) in a solid state, and add water according to the table. After stirring for 1 minute, compress 1.0 g of the mixture into a tablet using a tablet press (Riken Seiki MS05-100) at a force of 20 MPa, and then crush it with a hammer to obtain the composition.

[0139] The average particle size and proportion of component (A) and component (B) used in the manufacture of the supported particles in the examples and comparative examples, as well as the amount of water used in the manufacture, are shown in Tables 3 and 4, respectively.

[0140] [Table 3]

[0141]

[0142] [Table 4]

[0143]

[0144] The particle size distribution and average particle size of the compositions of the examples manufactured under the conditions in Table 3 are shown in Table 5. In addition, the particle size distribution and average particle size of the supported particles, the amount (parts by mass) of component (B) of the supported particles relative to 100 parts by mass of component (A), and the average particle size ratio of the supported particles to component (A) of the raw material are shown in Table 6.

[0145] It should be noted that, as shown in Table 2, the particle size of all components (B) used, except for (B5), is less than 100 μm. Therefore, it can be considered that almost all particles smaller than 100 μm removed by sieving the compositions of the examples are components (B) that are not supported on the surface of component (A). Based on this result, the amount (parts by mass) of component (B) relative to 100 parts by mass of component (A) is calculated by [parts by mass of component (B) used - parts by mass of particles smaller than 100 μm].

[0146] [Table 5]

[0147]

[0148] [Table 6]

[0149]

[0150] The particle size distribution and average particle size of the comparative example compositions manufactured under the conditions in Table 4 are shown in Table 7. In addition, the particle size distribution and average particle size of the supported particles of the comparative examples, the amount (parts by mass) of component (B) of the supported particles relative to 100 parts by mass of component (A), and the average particle size ratio of the supported particles to component (A) of the raw material are shown in Table 8.

[0151] As in the example, determine the amount (parts by mass) of component (B) in the obtained loaded particles relative to 100 parts by mass of component (A).

[0152] [Table 7]

[0153]

[0154] [Table 8]

[0155]

[0156] Representative microscopic images (taken with a Keyence VHX-1000 digital microscope) of the loaded particles, component (A) alone, and component (B) alone, when manufactured using 9g of silica sand 1 as component (A), 1g of CMC1 as component (B), and 0.5g of water, are shown below. Figure 1 , Figure 2 and Figure 3 .from Figure 1 As can be seen from the above, through the method of this application, cellulose derivative particles are supported on the surface of silica sand particles, which are component (A). Furthermore, by... Figure 2 and Figure 3 and Figure 1 A comparison shows that the particle sizes of components (A) and (B) remain almost unchanged before and after the particle manufacturing process.

[0157] Next, tests on the drainage and dispersion suppression properties of the obtained composition will be described.

[0158] Drainage performance was determined by the following methods.

[0159] (1) Preparation of soil for drainage test

[0160] Arakida soil (manufactured by KOHNAN) was sieved through an 8mm sieve to obtain a sample that passed through the 8mm sieve. The moisture content of this sample was adjusted to 21% by mass, and 80g was weighed into a 300mL polymer container.

[0161] Then, the specified amounts of each composition from Table 5 were spread onto the Araki field soil. After standing for 3 minutes, the soil was stirred 30 times with a scraper and used as the test soil.

[0162] (2) Drainage test of the soil prepared for the test

[0163] A 100 mL polymer container with a 1 cm diameter hole at the bottom was lined with gauze and filled with all the soil prepared in (1). Using a Nakaya showerhead (manufactured by Nakaya Chemical Industries) to simulate rainfall, 25 mL of water was sprayed onto the soil, and the amount of water draining from the bottom hole was measured over time. The start of drainage was set to time 0, and the slope (drainage volume) ÷ (time) was calculated from the measurements taken from 0 to 10 seconds. This operation was repeated 5 times, and the slope S (g / s) for the 5th measurement was determined.

[0164] Similarly, in a 100mL polymer container with a 1cm diameter hole at the bottom, soil without the composition was filled, and the same operation was repeated 5 times. The slope B (g / s) of the 5th operation was then determined.

[0165] Using the obtained slopes, calculate (slope S ÷ slope B) × 100, which is taken as the drainage capacity. The larger this value is, the higher the drainage capacity.

[0166] The dispersion inhibition was determined by the following method.

[0167] Within a 12cm vertical range above the ground, a wind speed of 2m / s is applied while 4-5g of the obtained loaded particles are dropped from a height of 15cm above the ground. After the particles have fallen, the wind is stopped, and the remaining composition within 20cm of the drop site is collected and its mass is measured.

[0168] Calculate (mass of the composition remaining within 20cm ÷ mass of the composition before falling) × 100, and use this as the dispersion inhibition value. The larger this value, the higher the dispersion inhibition value.

[0169] The compositions from the examples in Table 5 were used to evaluate water drainage and scattering suppression. The results are shown in Table 9.

[0170] It should be noted that the soil conditioner composition is dispersed in soil filled into a 100 mL polymer container in the manner specified in Table 9, with the amount of the composition added relative to the soil. For example, if the soil conditioner composition is added as 0.1 parts by weight relative to 100 parts by weight of soil, the soil surface area is 0.00196 m². ２ Add 0.08g of the soil conditioner composition. In this case, relative to each 1000m³ 2 For each 10 years of soil, the amount of soil conditioner composition added is 40.8 kg.

[0171] [Table 9]

[0172]

[0173] As shown in Table 9, compositions containing CMC-supported particles on the surface of silica sand exhibit good drainage and dispersion properties (Examples 1-13). Furthermore, compositions containing HPMC or HEC-supported particles on the surface of silica sand also exhibit good drainage and dispersion properties (Examples 14, 15). Moreover, compositions containing CMC-supported particles on the surface of calcium carbonate, zeolite, or PKS also exhibit good drainage and dispersion properties (Examples 16-19).

[0174] Next, the compositions of the comparative examples in Table 7 were used to evaluate their drainage and dispersion suppression properties. The results are shown in Table 10.

[0175] It should be noted that the amount of soil conditioner composition added per 10 years is the same value calculated as in Table 9.

[0176] [Table 10]

[0177]

[0178] Table 10 shows the following. It should be noted that Comparative Example 1 is a blank test (drainage 100) only for soil drainage, and no evaluation of dispersion inhibition was conducted.

[0179] If only silica sand 1 is added without component (B), the scattering suppression is good, but the drainage performance is extremely poor (Comparative Example 2). Therefore, component (B) is necessary to achieve good drainage performance. Furthermore, if only CMC1 is used for evaluation, the drainage performance is slightly improved, but the scattering suppression is extremely poor (Comparative Example 3). From these results, it is clear that both component (A) and component (B) are required to achieve the objectives of this application.

[0180] Furthermore, if silica sand 4 (175 μm) with a small average particle size or silica sand 5 (1500 μm) with a large average particle size is used, the former has poor dispersion suppression (Comparative Example 4), and the latter has poor drainage (Comparative Example 5). Moreover, if the ratio of the average particle size of the supporting particles to the average particle size of (A) is large, that is, if the supporting particles are agglomerated, then although the dispersion suppression is good, the drainage is poor (Comparative Examples 6 and 7).

[0181] In addition, CMC5 (500 μm), which has a very large average particle size, also has low drainage capacity (Comparative Example 8).

[0182] If silica sand 1 and CMC1, which exhibit good drainage and dispersion suppression properties, are mixed, tableted, and then pulverized, the mass ratio of the CMC1 carried relative to silica sand 1 is drastically reduced (4.40%) when using the pulverized particles. Furthermore, due to pulverization, the average particle size is also large, resulting in a significant reduction in drainage performance (Comparative Example 9). Similarly, using calcium carbonate 3 as a carrier also reduces drainage performance (Comparative Example 10).

[0183] If cellulose powder with unsubstituted hydroxyl groups is used, good drainage properties cannot be obtained (Comparative Example 11). Furthermore, using SAP, a water-absorbing polymer, as component (B) also results in poor drainage properties (Comparative Example 12). Moreover, if diatomaceous earth with a bulk density of approximately 20% of silica sand is used, the dispersion suppression properties are extremely reduced (Comparative Example 13).

[0184] It should be noted that if a large amount of the loaded particles obtained from silica sand 1 and CMC1, which exhibit good drainage and dispersion inhibition, are added to the soil, clogging occurs and the drainage is drastically reduced (Comparative Example 14).

[0185] In addition to the embodiments described above, the present invention also discloses the following methods.

[0186] <1>

[0187] A soil conditioner composition comprising cellulose derivative supported particles ((B) component) on the surface of water-insoluble particles ((A) component).

[0188] <2>

[0189] according to <1> The soil conditioner composition wherein the average particle size of the cellulose derivative-supported particles is preferably 200 μm or more, more preferably 250 μm or more, even more preferably 300 μm or more, and preferably 1000 μm or less, more preferably 700 μm or less, and even more preferably 600 μm or less.

[0190] <3>

[0191] according to <1> or <2> The soil conditioner composition, wherein component (A) is at least one selected from palm shell, zeolite, silica sand and calcium carbonate.

[0192] <4>

[0193] according to <1> to <3> In any one of the soil conditioner compositions, the average particle size of component (A) is preferably 180 μm or more, more preferably 200 μm or more, even more preferably 250 μm or more, and further preferably 1000 μm or less, more preferably 650 μm or less, and even more preferably 350 μm or less.

[0194] <5>

[0195] according to <1> to <3> In any one of the soil conditioner compositions, the bulk density of component (A) is preferably 0.5 g / cm³. ３ The above, more preferably 0.8 g / cm³ ３ The above is further preferred to be 1.0 g / cm³. ３ In addition, the preferred value is 1.5 g / cm³. ３ The following is more preferably 1.4 g / cm³ ３ The following is a further preferred value: 1.35 g / cm³ ３ The following is a further preferred value: 1.3 g / cm³ ３ the following.

[0196] <6>

[0197] according to <1> to <5> The soil conditioner composition according to any one of the following, wherein the cellulose derivative contained in component (B) is formed by replacing one or all of the hydrogen atoms of the hydroxyl groups of cellulose.

[0198] <7>

[0199] according to <1> to <6> The soil conditioner composition described in any one of the following statements, wherein,

[0200] (B) The cellulose derivative contained in the component is selected from at least one of the following:

[0201] (B-1) Carboxyalkyl cellulose or its salt,

[0202] (B-2) (carboxyalkyl)alkyl cellulose or its salt,

[0203] (B-3) Alkyl cellulose,

[0204] (B-4) hydroxyalkyl cellulose, and

[0205] (B-5)(alkyl)hydroxyalkyl cellulose.

[0206] <8>

[0207] according to <1> to <6> The soil conditioner composition described in any one of the following statements, wherein,

[0208] (B) The cellulose derivative contained in the component is selected from at least one of the following:

[0209] (B-1) Carboxyalkyl cellulose or its salts in which some or all of the hydrogen atoms of the hydroxyl groups of cellulose are replaced by carboxyalkyl groups, preferably carboxymethyl cellulose or its salts, carboxyethyl cellulose or its salts, etc., having a carboxyl group bonded to an alkyl group having 1 or more and 4 or fewer carbon atoms (wherein the salt is a sodium salt, potassium salt, calcium salt, ammonium salt, etc.) (hereinafter referred to as (B-1) component).

[0210] (B-2) Cellulose in which some or all of the hydrogen atoms of the hydroxyl groups are replaced by carboxyl alkyl groups and alkyl groups, preferably (carboxymethyl) methyl cellulose or its salt, (carboxymethyl) ethyl cellulose or its salt, etc., having a group having a carboxyl group bonded to an alkyl group having 1 or more and 4 or fewer carbon atoms and an alkyl group having 1 or more and 4 or fewer carbon atoms (wherein the salt is a sodium salt, potassium salt, calcium salt, ammonium salt, etc.) (hereinafter referred to as (B-2) component).

[0211] (B-3) Alkyl cellulose in which some or all of the hydrogen atoms of the hydroxyl groups are replaced by alkyl groups. Specifically, alkyl celluloses such as methyl cellulose and ethyl cellulose have 1 or more but less than 4 carbon atoms in their alkyl groups (hereinafter referred to as (B-3) components).

[0212] (B-4) Hydroxyalkyl cellulose in which some or all of the hydrogen atoms of the hydroxyl group are replaced by hydroxyalkyl groups, preferably hydroxyalkyl cellulose such as hydroxyethyl cellulose and hydroxypropyl cellulose, in which the hydroxyalkyl group has 2 or more and 4 or fewer carbon atoms (hereinafter referred to as (B-4) component).

[0213] as well as

[0214] (B-5) Cellulose in which some or all of the hydrogen atoms of the hydroxyl group are replaced by alkyl and hydroxyalkyl groups, specifically (alkyl)hydroxyalkyl cellulose, such as (hydroxyethyl) methyl cellulose, (hydroxyethyl) ethyl cellulose, (hydroxypropyl) methyl cellulose, (hydroxypropyl) ethyl cellulose, etc., in which the alkyl group has 1 or more carbon atoms and 4 or less, and the hydroxyalkyl group has 2 or more carbon atoms and 4 or less (hereinafter referred to as (B-5) component).

[0215] <9>

[0216] according to <8> The soil conditioner composition wherein the cellulose derivative contained in component (B) is at least one selected from (B-1), (B-4) and (B-5).

[0217] <10>

[0218] according to <8> or <9> The soil conditioner composition wherein (B-1) is preferably composed of carboxyalkyl cellulose or a salt thereof.

[0219] <11>

[0220] according to <8> or <9> The soil conditioner composition of the above, wherein the carboxyl group of (B-1) carboxyalkyl cellulose or its salt is an alkali metal salt such as sodium salt or potassium salt; an alkaline earth metal salt such as magnesium salt or calcium salt; or an ammonium ion salt, preferably an alkali metal salt, more preferably a sodium salt.

[0221] <12>

[0222] according to <1> to <11> In any one of the soil conditioner compositions, the average particle size of the cellulose derivative particles contained in component (B) is preferably 200 μm or less, more preferably 100 μm or less.

[0223] <13>

[0224] according to <12> The soil conditioner composition wherein the average particle size of the cellulose derivative particles contained in component (B) is preferably 10 μm or more, more preferably 20 μm or more, and further preferably 200 μm or less, more preferably 100 μm or less.

[0225] <14>

[0226] according to <1> to <13> In any one of the soil conditioner compositions, wherein the degree of substitution of hydrogen in the hydroxyl groups of the cellulose derivative contained in component (B) is preferably 0.3 or more, more preferably 0.6 or more, even more preferably 1.0 or more, and further preferably 1.8 or less, more preferably 1.6 or less.

[0227] <15> :

[0228] according to <1> to <14> The soil conditioner composition according to any one of the following, wherein the viscosity of a 1% aqueous solution of the cellulose derivative contained in component (B) is preferably 5 mPa·s or more at 25°C, more preferably 15 mPa·s or more, even more preferably 100 mPa·s or more, and preferably 5000 mPa·s or less, more preferably 4000 mPa·s or less, and even more preferably 3500 mPa·s or less.

[0229] <16>

[0230] according to <1> to <15> In any one of the soil conditioner compositions, the amount of component (B) in the cellulose derivative-supported particles is preferably 1 part by mass or more, more preferably 3 parts by mass or more, and even more preferably 10 parts by mass or more, and further preferably 100 parts by mass or less, more preferably 70 parts by mass or less, and even more preferably 50 parts by mass or less, relative to 100 parts by mass of component (A).

[0231] <17>

[0232] according to <1> to <16> In any one of the soil conditioner compositions, the content of the (B) component particles in the cellulose derivative-supported particles is preferably 70% by mass or more, more preferably 90% by mass or more, and less than 100% by mass.

[0233] <18>

[0234] according to <1> to <17> The soil conditioner composition according to any one of the following methods, wherein the ratio of the average particle size of the cellulose derivative-supported particles to the average particle size of component (A) is 3.0 or less.

[0235] <19>

[0236] according to <18> The soil conditioner composition wherein the ratio of the average particle size of the cellulose derivative-supported particles to the average particle size of component (A) is 2.5 or less.

[0237] <20>

[0238] according to <18> The soil conditioner composition wherein the ratio of the average particle size of the cellulose derivative-supported particles to the average particle size of component (A) is 1.0 or more, more preferably 1.3 or more, even more preferably 1.4 or more, and preferably 3.0 or less, more preferably 2.5 or less.

[0239] <21>

[0240] according to <1> to <20> The soil conditioner composition described in any one of the following statements, wherein,

[0241] (A) The component is selected from at least one of palm shell, zeolite, silica sand, and calcium carbonate.

[0242] (B) is at least one selected from (B-1) carboxyalkyl cellulose or its salt, (B-4) hydroxyalkyl cellulose and (B-5) (alkyl) hydroxyalkyl cellulose.

[0243] <22>

[0244] according to <1> to <21> The soil conditioner composition described in any one of the following statements, wherein,

[0245] (A) The component is selected from at least one of palm shell, zeolite, silica sand, and calcium carbonate.

[0246] (B) The component is at least one selected from (B-1) carboxyalkyl cellulose or its salt, (B-4) hydroxyalkyl cellulose and (B-5) (alkyl)hydroxyalkyl cellulose.

[0247] The ratio of the average particle size of the cellulose derivative-supported particles to the average particle size of component (A) is 3.0 or less, preferably 2.5 or less.

[0248] <23>

[0249] <1> to <22> The method for manufacturing the soil conditioner composition according to any one of the following is a method for manufacturing a composition containing (A) and (B) components, wherein (B) components are supported on the surface of (A) components, and the method is selected from the mixing method, the infiltration loading method or the initial wetting method, preferably the mixing method carried out in the presence of water.

[0250] <24>

[0251] according to <23> The method for manufacturing the soil conditioner composition, wherein the mixing process in the presence of water comprises the following steps:

[0252] (Step 1) The process of mixing component (A) with water to obtain water-insoluble particles with water adhering to the surface;

[0253] (Step 2) The process of adding component (B) to the water-insoluble particles with water adhering to their surface obtained in Step 1 and mixing them;

[0254] (Step 3) The mixture containing water obtained in step 2 is dried while being stirred as needed, thereby obtaining a mixture containing (A) component with (B) component supported on its surface.

[0255] <25>

[0256] according to <24> The method for manufacturing the soil conditioner composition further includes the following steps:

[0257] (Step 4) The process of refining the aggregated carrier particles in the mixture obtained in step 3.

[0258] <26>

[0259] A soil improvement method, wherein, for soil 10 years, the following amounts are dispersed <1> to <22> The soil conditioner composition described in any one of the following statements, i.e., converted to cellulose derivatives, is preferably 0.4 kg or more, more preferably 2 kg or more, further preferably 4000 kg or less, more preferably 2000 kg or less, even more preferably 1000 kg or less, even more preferably 800 kg or less, even more preferably 400 kg or less, and even more preferably 120 kg or less.

[0260] <27>

[0261] A soil improvement method, wherein, for soil 10a, the following amounts are added <1> to <22> The soil conditioner composition described in any one of the following statements, i.e., converted to cellulose derivatives, is preferably 0.04 kg or more, more preferably 1.6 kg or more, and further preferably 390 kg or less, more preferably 200 kg or less, even more preferably 20 kg or less, and even more preferably 12 kg or less.

[0262] <28>

[0263] A soil amendment method, wherein, relative to 100 parts by weight of soil, the following amount is added <1> to <22> The soil conditioner composition described in any one of the following methods is preferably 0.001 parts by mass or more, more preferably 0.005 parts by mass or more, and further preferably less than 10 parts by mass, more preferably 5 parts by mass or less, even more preferably 2.5 parts by mass or less, even more preferably 2.0 parts by mass or less, even more preferably 1.0 parts by mass or less, and even more preferably 0.3 parts by mass or less.

[0264] <29>

[0265] A soil amendment method, wherein, relative to 100 parts by weight of soil, the following amount is added <1> to <22> In any one of the soil conditioner compositions, the cellulose derivative as component (B) is preferably 0.0001 parts by mass or more, more preferably 0.0004 parts by mass or more, and further preferably 0.95 parts by mass or less, more preferably 0.5 parts by mass or less, even more preferably 0.05 parts by mass or less, and even more preferably 0.03 parts by mass or less.

Claims

1. A soil conditioner composition comprising cellulose derivative-supporting particles on which a (B) component is supported on the surface of an (A) component, the (A) component being a water-insoluble particle, and the (B) component being a cellulose derivative particle.

2. The soil amendment composition of claim 1, wherein, The average particle diameter of the cellulose derivative-supporting particle is 200 μm or more and 1000 μm or less.

3. The soil amendment composition of claim 1, wherein, The cellulose derivative is at least one selected from the group consisting of: (B-1) carboxyalkyl cellulose or a salt thereof, (B-2) (carboxyalkyl)alkyl cellulose or a salt thereof, (B-3) alkyl cellulose, (B-4) hydroxyalkyl cellulose, and (B-5) (alkyl)hydroxyalkyl cellulose.

4. The soil amendment composition of any one of claims 1-3, wherein, The average particle diameter of the cellulose derivative particle is 200 μm or less.

5. The soil amendment composition of any one of claims 1-3, wherein, The average particle diameter of the cellulose derivative-supporting particle / the average particle diameter of the (A) component is 3.0 or less.

6. The soil amendment composition of claim 5, wherein, The average particle diameter of the cellulose derivative-supporting particle / the average particle diameter of the (A) component is 2.5 or less.

7. The soil amendment composition of any one of claims 1-3, wherein, The degree of substitution of the hydrogen of the hydroxyl group of the cellulose derivative contained in the (B) component is 0.3 or more.

8. The soil amendment composition of claim 1, wherein, The amount of the (B) component in the cellulose derivative-supporting particle is 1 mass part to 100 mass parts with respect to 100 mass parts of the (A) component.

9. The soil amendment composition of claim 1, wherein, The (A) component is at least one selected from the group consisting of palm shell, silica sand, calcium carbonate, and zeolite.

10. The soil amendment composition of claim 1, wherein, The (B) component is at least one selected from the group consisting of (B-1) carboxyalkyl cellulose or a salt thereof, (B-4) hydroxyalkyl cellulose, and (B-5) (alkyl)hydroxyalkyl cellulose.

11. The soil amendment composition of claim 1, wherein, The (A) component is at least one selected from the group consisting of palm shell, silica sand, calcium carbonate, and zeolite, The (B) component is at least one selected from the group consisting of (B-1) carboxyalkyl cellulose or a salt thereof, (B-4) hydroxyalkyl cellulose, and (B-5) (alkyl)hydroxyalkyl cellulose.

12. The soil conditioner composition according to claim 1, comprising cellulose derivative-supporting particles on which a (B) component is supported on the surface of an (A) component, the average particle diameter of the cellulose derivative-supporting particle / the average particle diameter of the (A) component being 3.0 or less, The (A) component is at least one selected from the group consisting of palm shell, silica sand, calcium carbonate, and zeolite, The (B) component is at least one selected from the group consisting of (B-1) carboxyalkyl cellulose or a salt thereof, (B-4) hydroxyalkyl cellulose, and (B-5) (alkyl)hydroxyalkyl cellulose.

13. A production method of a soil conditioner composition comprising cellulose derivative-supporting particles on which a (B) component is supported on the surface of an (A) component, the (A) component being a water-insoluble particle, and the (B) component being a cellulose derivative particle, the production method comprising the following steps, Step 1: a step of mixing a water-insoluble particle, i.e., the (A) component, with water to obtain a water-insoluble particle on the surface of which water is attached; Step 2: a step of adding a cellulose derivative particle, i.e., the (B) component, to the water-insoluble particle on the surface of which water is attached obtained in Step 1 and mixing them. Process 3: The mixture containing water obtained in Process 2 is dried while stirring as necessary, to obtain a composition containing supported particles in which cellulose derivative particles (B) component are supported on the surface of water-insoluble particles (A) component.

14. A method of soil improvement wherein, For the soil 10a, a soil conditioner composition containing cellulose derivative supported particles, which contain water-insoluble particles (A) component and cellulose derivative particles (B) component supported on the surface of the (A) component, is applied in an amount of 0.4 kg or more and 4000 kg or less, converted into cellulose derivative supported particles.

15. A method of soil improvement wherein, For the soil 10a, the cellulose derivative particles (B) component contained in the soil conditioner composition containing cellulose derivative supported particles is applied in an amount of 0.04 kg or more and 390 kg or less, converted into cellulose derivative.

16. A method of manufacturing an improved soil, wherein, For the soil 10a, a soil conditioner composition containing cellulose derivative supported particles, which contain water-insoluble particles (A) component and cellulose derivative particles (B) component supported on the surface of the (A) component, is applied in an amount of 0.4 kg or more and 4000 kg or less, converted into cellulose derivative supported particles.

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